Of these firewall rules, which among the following would be appropriate?

Exhibit

Study the log given in the exhibit, Precautionary measures to prevent this attack would include writing firewall rules.

Of these firewall rules, which among the following would be appropriate?
A . Disallow UDP 53 in from outside to DNS server
B . Allow UDP 53 in from DNS server to outside
C . Disallow TCP 53 in form secondaries or ISP server to DNS server
D . Block all UDP traffic

View Answer

Answer: B

Explanation:

You only want your or your ISP’s outside DNS to be able to contact your inside DNS. All other traffic should be directed against the outside DNS.